/Engine/Source/Runtime/Landscape/Public/LandscapeDataAccess.h
bool GetWeightmapTextureData ( [ULandscapeLayerInfoObject](API\Runtime\Landscape\ULandscapeLayerInfoObject) * InLayerInfo, [TArray](API\Runtime\Core\Containers\TArray)< uint8 > & OutData, bool bInUseEditingWeightmap, bool bInRemoveSubsectionDuplicates )